Comprehensive Review: " APL1 " - Advanced DSP / EQ / Phase Correction Unit - Page 42 - Car Audio | DiyMobileAudio.com | Car Stereo Forum

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Old 3 Weeks Ago   #1026
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Default Re: Comprehensive Review: " APL1 " - Advanced DSP / EQ / Phase Correction Unit

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Originally Posted by StabMe View Post
I correct with APL only the full range.
The speakers are already time-aligned using REW and loopback measurements, level matched and i am using linear-phase crossovers. I generated them in Rephase with some minor EQ to correct huge dips of nulls and then, on top of that, i measure the aforementioned cube area with APL. I get about 80-100 measurements per side on APL.

By the way, level matching in REW doesn't may not necessarily work in how APL "sees" those level. Before applying the correction, i may re-do measurements in APL until levels in the power response across all the speakers in a three way look more or less even.

Stabme, when you do the Workshop measurements for level matching of the power responses of all drivers , do you use the area suggested by Raimonds or your cube?
In Workshop what accuracy of level matching you aim at between L/R channel and across the three ways, how many dBs ? I have found it quite difficult to match all six levels of acoustic power frequency response for a 3way system.
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Old 3 Weeks Ago   #1027
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Default Re: Comprehensive Review: " APL1 " - Advanced DSP / EQ / Phase Correction Unit

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Originally Posted by an.vamv View Post
Stabme, when you do the Workshop measurements for level matching of the power responses of all drivers , do you use the area suggested by Raimonds or your cube?
In Workshop what accuracy of level matching you aim at between L/R channel and across the three ways, how many dBs ? I have found it quite difficult to match all six levels of acoustic power frequency response for a 3way system.

Since you are doing measurements of L side and R side, then this shouldn't be an issue. If the sound seems shifted to the left or right of center when complete, then simply adjust one of the following:


1. Balance of source L-R
2. Adjust gain in DSP for L or R side drivers together for more/less output to center up
3. Adjust the filter gain of one side to center up.

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Old 3 Weeks Ago   #1028
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Default Re: Comprehensive Review: " APL1 " - Advanced DSP / EQ / Phase Correction Unit

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Holmz, in practice how do you approach the issue of measurements with Workshop ??
My description was more academic, and how one might generically do this in MATLAB or similar.
I thought someone was doing a video?
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Old 3 Weeks Ago   #1029
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Default Re: Comprehensive Review: " APL1 " - Advanced DSP / EQ / Phase Correction Unit

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Originally Posted by StabMe View Post
By the way, level matching in REW doesn't may not necessarily work in how APL "sees" those level. Before applying the correction, i may re-do measurements in APL until levels in the power response across all the speakers in a three way look more or less even.
You can import the DAT files that Workshop creates directly into REW. By doing this, you can do all of your measuring with Workshop so what you see in both apps matches each other.

There are some specific things that REW can't do with the DAT files(like waterfall plots) but it's a great way to compare what you are doing in both apps.

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Old 3 Weeks Ago   #1030
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Default Re: Comprehensive Review: " APL1 " - Advanced DSP / EQ / Phase Correction Unit

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Originally Posted by an.vamv View Post
Stabme, when you do the Workshop measurements for level matching of the power responses of all drivers , do you use the area suggested by Raimonds or your cube?
In Workshop what accuracy of level matching you aim at between L/R channel and across the three ways, how many dBs ? I have found it quite difficult to match all six levels of acoustic power frequency response for a 3way system.
I level match each speaker separately with REW and pink noise using moving mic technic. Yes, the same area. When speakers are more or less level matched, i measure in Workshop and this time it is a stereo signal with crossovers and level matching applied, not each speaker individually. Pretty basic technique.
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Default Re: Comprehensive Review: " APL1 " - Advanced DSP / EQ / Phase Correction Unit

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Originally Posted by LumbermanSVO View Post
You can import the DAT files that Workshop creates directly into REW. By doing this, you can do all of your measuring with Workshop so what you see in both apps matches each other.

There are some specific things that REW can't do with the DAT files(like waterfall plots) but it's a great way to compare what you are doing in both apps.
Wow, i didn't know that. Thanks!

BTW, i believe that Woekshop does level match speakers to the level of the first measured speaker. So in order to avoid clipping, one should play with Zero Level Eq setting, or measure the quitest driver first. Level matching is very useful when measuring small area around the head - the levels are precisely set for this particular position.

Would love to hear Raimonds input on level matching. And on measuring small area around the head VS the whole cabin
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